Science
Mechanism of Action
Hamamelis Virginiana Leaf Water acts through its rich composition of bioactive compounds, including phenolic acids, flavonoids, catechins, proanthocyanidins, and tannins like hamamelitannin and gallic acid. These constituents work synergistically as an astringent by constricting skin proteins and blood vessels, thereby tightening pores and diminishing excess oil and redness. Its anti-inflammatory effects stem from modulating cytokine expression and NF-κB signaling, effectively soothing irritation. Furthermore, it exhibits antimicrobial (antibacterial, antifungal, antiviral) and antioxidant capabilities, shielding the skin from UV-induced damage and pollution, while also supporting skin regeneration and wound healing processes.
Research
Clinical Evidence
Medium confidenceN/A
Key findings
- 01 Inhibitory activity against bacterial triggers of autoimmune inflammatory diseases (e.g., P. aeruginosa, S. pyogenes) was observed with aqueous leaf extract at concentrations between 0.056% and 0.112% (560-1120 μg/mL).
- 02 A 2% concentration of witch hazel stem and leaf extract (HVE) significantly inhibited the increase in intracellular Ca2+ concentrations caused by particulate matter contact in human keratinocytes, indicating a protective effect against pollution-induced damage.
- 03 A face product containing 8.5% Hamamelis Virginiana (Witch Hazel) Water was found to be non-irritating in human patch tests.
Transparency
Dusting Analysis
While Hamamelis Virginiana Leaf Water was demonstrated to be non-irritating at 8.5% in a face product, high concentrations may lead to skin irritation and dryness, especially as some distillates contain up to 14% added alcohol. Formulators should prioritize alcohol-free versions and carefully manage total concentrations to avoid adverse effects, particularly with cumulative exposure to botanicals containing shared constituents of concern.
The Formula
Formulation
Stability
Witch hazel extracts typically possess a pH value ranging from 4.0 to 6.5, though some sources indicate a pH of 3.0-5.0 for the extract itself. Stability is maintained within this acidic to slightly acidic range. It is crucial to select alcohol-free distillates, as traditional witch hazel distillates may contain up to 14% added alcohol, which can be detrimental to skin health.
Conflicts
- High concentrations can lead to skin irritation and dryness.
- Potential for cumulative sensitization if combined with multiple other botanical ingredients that contain shared constituents of concern.
- Its astringent properties may cause irritation if applied directly around the eyes.
Safety
Safety Profile
The Cosmetic Ingredient Review (CIR) Expert Panel concluded that Hamamelis virginiana-derived ingredients are safe for cosmetic use when formulated to be non-irritating and non-sensitizing. The FDA permits its use as an Over-the-Counter (OTC) astringent. While reported in cosmetic preparations at concentrations up to 43%, care must be taken regarding formulation concentration to prevent irritation. There is no specific SCCS assessment available.
Your Skin
Skin Compatibility
Our Assessment
Verdict
Hamamelis Virginiana Leaf Water is a valuable ingredient, offering broad-spectrum benefits from astringency and anti-inflammation to pollution protection, provided it is formulated without alcohol and at appropriate, non-irritating concentrations.
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